Laboratory investigation on the membrane behaviour of highly compacted GMZ bentonite under isothermal conditions

被引：5
|
作者：
Su, Wei [1 ,2 ]
Wang, Qiong [1 ,2 ]
Luo, Xin-long [1 ]
Ye, Wei-min [1 ,2 ]
Deng, Yong-feng [3 ]
机构：
[1] Tongji Univ, Key Lab Geotech & Underground Engn, Minist Educ, Shanghai 200092, Peoples R China
[2] Minist Educ, United Res Ctr Urban Environm & Sustainable Dev, Shanghai 200092, Peoples R China
[3] Southeast Univ, Inst Geotech Engn, Sch Transportat, Nanjing, Peoples R China
来源：
ACTA GEOTECHNICA | 2023年 / 18卷 / 09期
基金：
中国博士后科学基金; 中国国家自然科学基金; 国家重点研发计划;
关键词：
Chemico-osmotic efficiency coefficient; Combined thermo-chemical condition; Compacted bentonite; Membrane behaviour; Microstructural rearrangement; CHEMICO-OSMOTIC EFFICIENCY; SWELLING PRESSURE; HYDRAULIC CONDUCTIVITY; HYDROMECHANICAL BEHAVIOR; MECHANICAL BEHAVIOR; TEMPERATURE; PERFORMANCE; WATER; CHEMISTRY; BARRIER;
D O I：
10.1007/s11440-023-01854-z
中图分类号：
P5 [地质学];
学科分类号：
0709 ; 081803 ;
摘要：
The persistence of membrane behaviour of compacted bentonite barriers under thermo-chemical conditions is of significance for their containment performance in high-level radioactive waste repository. To quantify the membrane behaviour of compacted GMZ bentonite under the combined thermo-chemical effects, a series of multi-stage membrane tests were conducted using NaCl solution with different concentrations under controlled iso-thermal conditions of 20 degrees C, 40 degrees C and 60 degrees C, respectively. Results showed that the chemico-osmotic efficiency coefficient, omega, of compacted GMZ bentonite decreased with the increasing NaCl concentrations. Moreover, with elevating temperature, distinct decrease of the induced differential pressure across specimen was observed, indicating the negative impact of temperature on the membrane behaviour of compacted bentonite. By monitoring the variation of hydraulic conductivity of specimens before and after membrane tests under different thermal conditions, the destruction of membrane behaviour of the specimens under thermo-chemical conditions was analysed from the perspective of microstructural rearrangement.
引用
收藏
页码：4821 / 4833
页数：13
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